If the zero is appearing on export (to the csv file from ZC) then the zero was already in the database. Overall, Zc is basically supposed to ignore any different character if it is not a minus basically. Anything other than a minus in a default install I thought it was supposed to display as a +. Maybe it is process as a plus but display whatever is entered. Anyways, to fix, from within your editor (ideally Open Office) simply change and save that column with either blank if nothing is to prefix the display or the appropriate symbol to display (+, -, etc...)
Should fix your issue, then could export again to see if it remains as input.
Bookmarks